Commission 3 â Geodynamics and Earth Rotation

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Report of the International Association of Geodesy 2007-2011 ─ Travaux de l’Association Internationale de Géodésie 2007-2011Hense A., J. Sündermann, H. Drewes, M. Thomas, X. Chen, R. Dill, M. Müller, F. Seitz, J. Struck, C. Walter,and T. Winkelnkemper, 2009. Physically consistent system model for the study of the Earth's rotation, surfacedeformation and gravity field parameters: Scientific results of the DFG project, Deutsche GeodätischeKommission : Reihe B, Angewandte Geodäsie; 317, Beck, 53.Hulley, G.C. and E.C. Pavlis, 2007. A ray-tracing technique for improving Satellite Laser Ranging atmosphericdelay corrections, including the effects of horizontal refractivity gradients, J. Geophys. Res., 112, B06417, doi:10.1029/2006JB004834.Nastula J., R.M. Ponte, and D.A. Salstein, 2007. Comparison of polar motion excitation series derived fromGRACE and from analyses of geophysical fluids. Geophys. Res. Lett., 34, L11306, doi: 10.1029/2006GL028983.Nastula, J. D.A. Salstein, and B. Kolaczek, 2009. Patterns of atmospheric excitation functions of polar motionfrom high-resolution regional sectors, J. Geophys. Res., 114, B03307, doi: 10.1029/2008JB005605.Pavlis, E.C., V. Mendes, and G. Hulley, 2008. Tropospheric Model: Optical Techniques, in. IERS Conventions2003, G. Petit and B. Luzum (eds.), IERS Technical Note 32, online version of updated Conventions:http://tai.bipm.org/iers/convupdt/convupdt.html, Paris, France.Ponte, R. M., and K. J. Quinn, 2009. Bottom pressure changes around Antarctica and wind-driven meridionalflows, Geophys. Res. Letters, 36, L13604, doi: 10.1029/2009GL039060.Ponte, R.M., K.J. Quinn, C. Wunsch, and P. Heimbach, 2007. A comparison of model and GRACE estimates ofthe large-scale seasonal cycle in ocean bottom pressure. Geophys. Res. Letters, 34, L09603,doi:10.1029/2007GL029599.Ponte, R.M., and S.V. Vinogradov, 2007. Effects of stratification on the large-scale ocean response to barometricpressure. J. Phys. Oceanography, 37, pp. 245-258.Quinn, K.J., and R.M. Ponte, 2008. Estimating weights for the use of time-dependent GRACE data inconstraining ocean models, J. Geophys. Res., 113, C12013, doi: 10.1029/2008JC004903.Quinn, K. J., and R. M. Ponte, 2010. Uncertainty in ocean mass trends from GRACE, Geophys. J. Int., 181,doi:10.1111/j.1365-246X.2010.04508.x, pp. 762-768.Salstein D.A., Nastula J., Quinn K., MacMillan D., Mendes Cerveira, P.J., 2008a. Atmospheric excitation ofEarth rotation/polar motion at high temporal resolution, Proceedings Journées Systèmes de Référence Spatio-Temporels 2007, ed. N. Capitaine, Paris Observatory, pp. 177-179.Salstein, D., R.M. Ponte, and K. Cady-Pereira. 2008b. Uncertainties in atmospheric surface pressure fields fromglobal analyses. J. Geophys. Res., 113, doi:10.1029/2007JD009531.Vinogradova, N. T., R.M. Ponte, and D. Stammer, 2007. The relation between sea level and bottom pressure andthe vertical dependence of oceanic variability. Geophys. Res. Letters, 34, doi: 10.1029/2006GL02858.Vinogradova, N.T., R.M. Ponte, M.E. Tamisiea, J.L. Davis, and E.M. Hill, 2010. Effects of self-attraction andloading on annual variations of ocean bottom pressure. J. Geophys. Res., 115, C06025,doi:10.1029/2009JC005783.Wunsch, C., P. Heimbach, R.M. Ponte, I. Fukumori and the ECCO-GODAE consortium members, 2009. Theglobal general circulation of the oceans estimated by the ECCO-consortium. Oceanography, 22, pp. 88-103.Zhou, Y.H., J. Chen, and D.A. Salstein, 2008. Tropospheric and stratospheric wind contributions to Earth’svariable rotation through NCEP/NCAR reanalyses (2000-2005), Geophys. J. Int., doi: 10.1111/j.1365-246X.2008.03843.X.
Report of the International Association of Geodesy 2007-2011 ─ Travaux de l’Association Internationale de Géodésie 2007-2011Sub-Commission 3.4: Cryospheric Change and Earth DeformationPresident: James L. DavisVice-President: Detlef WolfIntroductionSubcommission 3.4 (Cryospheric Change and Earth Deformation) was started in 2007, and isintended to focus on those methods and techniques in Geodesy that focus on thedeformational response of the Earth to changes in glacier mass balance. This area is thus animportant component of the geodesy of the Earth system. Although, for consistency’s sake,there is some minor overlap with other subcommissions, the focus on Earth deformationbrings in a variety of geodetic observations and techniques, including ground- and spacebasedobservations of global and regional deformation, gravity, sea level, and ice thickness.The members’ activities are a mixture of observational and theoretical, covering short-term(i.e., ongoing melting) and longer-term (i.e., glacial isostatic adjustment) solid-Earth responseto cryospheric changes. (See also the Terms of Reference, below.) Members of the subcommissioninclude: J. Davis, R. Dietrich, P. Elósegui, H. Geirsson, E. Ivins, S. A. Khan, M.King, O. Kristiansen, G. A. Milne, I. Sasgen, D. Wolf, and X. Wu.Terms of ReferencePast and present changes in the mass balance of the earth's glaciers and ice complexes inducepresent-day deformation of the solid earth on a range of spatial scales, from the very local toglobal. The earth's deformational response to cryospheric change is complex due to a numberof factors, including: complexities in the viscoelastic structure of the earth; the spatial andtemporal variability of the mass changes; and the interaction between the cryosphere and theocean, which lead to a redistribution of cryospheric mass in a highly dynamic system. Thesecomplexities pose both observational and modeling challenges. The purpose of Subcommission3.4 is to promote, and where appropriate, to help coordinate research involvinggeodetic observation and modeling of earth deformation due to past and ongoing cryosphericchanges, with emphasis on present-day deformation taking place in the near field of existingice sheets and glaciers and the extent to which this deformation is a response to climatechange.Activities 2007–2011GIA Observation and ModelingThe modeling of glacial isostatic adjustment (GIA) is becoming more complex as both theEarth models [e.g., Klemann et al., 2008; Simpson et al., 2010] and ice history [e.g., van denBerg et al., 2008; Milne et al., 2008] evolve. At the same time, new geodetic observations areacquired and new methods for extracting the geodetic information are being developed [e.g.,Tamisiea et al., 2007; Pagli et al., 2007; Hill et al., 2008; Tamisiea et al., 2008]. Observationscontinue to be used to test and assess available GIA models [e.g., Khan et al., 2008; Groh etal., 2009; Sasgen, 2010].
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Commission 3 â Geodynamics and Earth Rotation